-The 33-year-old actor seen on Men set hours after wife Demi broke news of split -Couple said to be gearing up to battle over $290million fortune -Kutcher tweets he will always 'cherish' the time he spent with Demi and that marriage is 'the most difficult thing in the world' -Moore confirms split by releasing statement two months after allegations Kutcher cheated on her -Hints at his infidelity saying she is moving on because 'there are certain values and vows that I hold sacred' -Couple still following each other on Twitter and Demi's handle remains @mrskutcher

By Chris Johnson and Natalie Trombetta

The show must go on: Ashton Kutcher was seen on the set of Two And A Half Men just hours after Demi Moore filed for divorce

His marriage might but over but for Ashton Kutcher it appears that the show must go on.

The 33-year-old actor was seen on the set of Two And A Half Men just hours after it was revealed wife Demi Moore was filing for divorce.

Kutcher, who tweeted his sadness at the breakdown of the union, appeared strained as he was seen talking to friends and colleagues at work.

Dressed in a checked shirt and with his face unshaken and his hair long around his face the actor appeared forlorn as he was stood with a group of friends.

Later he emerged in a different outfit and was seen clutching his phone, perhaps hoping for some contact from his wife of six years.

Seeking comfort?

It has been reported that Demi is now gearing up to battle Ashton over their $290million fortune.

According to Radaronlione the actress made her decision to end their marriage weeks ago, in the wake of allegations Ashton has cheated and is now said to be speaking with her lawyers to secure a suitable settlement.

Yesterday Demi announced she is ending her six year marriage to Ashton.

The 49-year-old actress said in a statement that she is filing for divorce with 'great sadness and a heavy heart'.

Hinting at Kutcher's infidelity, Demi said: 'As a woman, a mother and a wife, there are certain values and vows that I hold sacred, and it is in this spirit that I have chosen to move forward with my life'.

Ready for battle? Ashton Kutcher and Demi Moore, seen here in happier times last year, are said to be gearing up to battle it out for their $290million worth in their divorce battle

Moore added that it's a trying time for her and her family and asked for people to respect her privacy.

Immediately after the announcement, 33-year-old Ashton posted his own statement on Twitter.

He wrote: 'I will forever cherish the time I spent with Demi.

'Marriage is one of the most difficult things in the world and unfortunately sometimes they fail. Love and Light, AK.'

Marriage breakdown: Demi and Ashton appeared to be showing strain in the weeks leading up to yesterday when the actress revealed she was filing for divorce

Message to fans: Ashton released his own statement on Twitter following Demi's announcement, saying he will always cherish the time they had together

The pair are still following each other on Twitter in wake of the announcement and Demi's handle remains @mrskutcher - something she may now consider changing.

Despite their dignified statements, Demi is now gearing up to battle it out over their $290m fortune after enduring public humiliated because of his alleged infidelity.

Star magazine reported that Ashton's work is a cause for contention between the pair and Radaronline quoted a friend close to the couple saying: 'Demi’s finally ready to move on after all these years because she’s sick of feeling like she can’t trust Ashton. Especially as his star continues to rise with Two and a Half Men, he’s become really vague about where — and with whom — he spends his time.'

Had enough: The allegations of Ashton's affair have taken its toll on Demi who has been looking painfully thin in recent months, seen left last month and sporting a fuller figure in 2009

Moore and Kutcher wed in September 2005. The couple's relationship hit the headlines in recent months as rumours swirled about Kutcher's alleged infidelity.

The Two And A Half Men star allegedly shared a night of passion with party girl Sara Leal, 22, at the Hard Rock Hotel in San Diego.

Texas-born Leal sold her story on Kutcher weeks after the fling, which took place on Ashton and Demi's sixth wedding anniversary, September 24.

Leal relived the sordid details of the night - including how they had unprotected sex - detailing that she had cavorted naked with Kutcher and a gaggle of girls in a hot tub in the luxurious hotel suite.

She claimed Kutcher told her he was separated from Demi before the Two And A Half Men star tried to persuade her to have a threesome along with her best friend Marta Borzuchowski - but in the end he settled for a two-hour romp with her.

Speaking of the fling, she told The Sun: 'We had sex twice. Everything felt natural.

We were having a good time. He was good, but it wasn't weird or perverted or creepy.

'He had good endurance. We were up for a while. It was about two hours.'

In the weeks after the story broke, Kutcher and Moore made apparent attempts to heal their relationship with Kabbalah retreats, including a camping trip to Cachuma Lake near Santa Barbara, California, last month.

The couple were accompanied by some close friends along with their Kabbalah instructor Yehuda Berg and photos emerged of the pair sat around an outdoor fire.

It was first time they were pictured together since news of Kutcher's alleged booze-fuelled one-night stand broke.

In the weeks that followed, Demi appeared to be suffering under the strain of her marriage breakdown, becoming gaunt and scarily skinny - reportedly dropping down to just 7st (98lbs) which given her height of 5ft 5in is considerably underweight.

The Leal affair was not the first time Kutcher has been accused of being unfaithful to Demi.

Kutcher was first accused of infidelity in September last year, when Brittney Jones, 21, said she had sex with the actor at the Beverly Hills home he once shared with his wife while she was away.

She also later claimed that Kutcher told her he had an open relationship with Demi and they would 'often engage in threesomes'.

Scene of the 'crime': Kutcher was said to have cavorted naked with Leal in the hot tub of the Hard Rock Hotel in San Diego before bedding her

Jones told Star: 'He looked over our texts and said he wanted me to delete all the messages from him. He then told me he wanted me to delete the texts I had sent to him. He said they could hurt him.'

At the time, the couple, who are worth an estimated £95million, brushed off the allegations.

Kutcher, who took over Charlie Sheen’s role in hit U.S. TV series Two And A Half Men earlier this year, wrote on Twitter at the time: 'I think Star magazine calling me a "cheater" qualifies as defamation of character. I hope my lawyer agrees.'

He added: 'Star magazine – you don’t get to stand behind "freedom of the press" when you are writing fiction.'

Campfire summit: Demi and Ashton met with Kabbalah counsellors last month in an apparent bid to heal their relationship

Escape: They visited Cachuma Lake in Santa Barbara, California for the retreat

Moore, who was previously married to Bruce Willis, started dating Kutcher in 2003. They married two years later.

In May last year Demi talked about wanting to start a family with Kutcher in an interview with Elle magazine - something that never came to pass.

The actress has three daughter with her ex Willis - Rumer, 23, Scout, 20, and Tallulah 17.

She has maintained a friendly relationship with the Die Hard star - even attending his wedding to underwear model Emma Heming in 2009. By the same token, Willis came to Demi and Ashton's wedding four years earlier.

Moore and Willis married in 1987 before divorcing 13 years later in 2000.

At the time of the split, Willis said: 'I felt I had failed as a father and a husband by not being able to make it work.'

Moore, who starred alongside Patrick Swayze in the 1990 movie Ghost, was first married to singer Freddy Moore.

They got hitched when she was aged 18 in 1980 and the relationship lasted four years. She still goes by his last name.

Happy families: Ashton and Demi pictured in 2008 with her ex-husband Bruce Willis, his wife Emma Heming and her family, along with Rumer, Tallulah and Scout - Demi and Bruce's three daughters

For Ashton - who is 16 years Demi's junior - Moore was his first wife.

He previously had relationships with the late Brittany Murphy and Mad Men's January Jones.

Today's news tops off a bad run for Ashton, who last week was at the centre of a Twitter fallout after posting messages of support for Pennsylvania State University football coach Joe Paterno.

Paterno, Penn State head coach for 46 years, had been fired for allegedly covering up sexual abuse by the school's former football defence coordinator Jerry Sandusky.

Kutcher responded to the news by tweeting: 'How do you fire Jo Pa? #insult #noclass as a hawkeye [the University of Iowa football team] fan I find it in poor taste.'

But his remarks cause a furious backlash - forcing Kutcher to admit he didn't have the full facts when he posted the message.

He then handed the control of his Twitter feed over to his management team at Katalyst Media to 'ensure the quality of its content'.